3.6L Boxster GT Racer

[Eric523]

Well, the unit is made by TEVES, the model is MK60 I beleive. It came installed on factory BMW M3 cars.
The reasons I upgraded the unit are:
- My stock boxster unit was only 3 channel. Which is one channel for each front wheel, and the rears shared a channel. So if one rear tire started to lock, the ABS affected both rears instead of just the one that was locking. Now, with a 4 channel, each wheel can be controlled individually.

- This unit is believed to have better programing for competition than the stock Boxster unit.

- This unit runs with inputs from brake pressure sensors, one for front and one for the rear, as well as a YAW sensor. I can send this brake pressure data into the CAN stream on my dash and log the numbers for driver feedback as well as technical feedback for the brake performance.

- This unit has its own diagnostic that I can plug into. I lost that function in my car for the stock unit when I removed the factory ECU and wiring harness.

I picked the components up from used parts dismantlers and eBay mostly...

[Eric523]

Sunday afternoon project after watching the F1 race today? Carbon dash installation! Quite the task with the new double a-pillar bars on the cage...

[DFW02S]

Wow, nice work!

[insite]

Eric, this is getting out of hand in a hurry. Incredible work; thx for sharing this.

[Eric523]

thanks. it is definitely getting out of hand now.The current version will be very Boxster RSRish. Only thing missing will be the 4.0L motor that is in the works for next year!

[Eric523]

Repainted the interior and exterior of the car. Needed to get the new bars in the cage painted, and the interior was showing some use after two years.

Every panel except the rear quarter panels are new, so they needed paint as well







Changed out the steering column for a later 987/997 version. This later column has an electronic steering angle sensor installed. This will give me more driver feedback data and it was nicer to use a factory part instead of trying to add aftermarket sensors. The column is mounted lower and moved to the right towards the center of the car.

[insite]

so when are you bringing it to road atlanta

[Eric523]

Originally Posted by insite

so when are you bringing it to road atlanta

haha, that would be quite the ride! About 4500 miles round trip from my place. Hopefully it wouldn't end up like the last PCA event there with all of the nice machinery going down on the first lap I would have likely been 2 or 3 rows behind them, right in the thick of the mess!

However, I may make the trip to COTA next year if it is available again. Timing just didn't work out this time around.

[insite]

Yeah, that was quite a spectacle! It WAS pretty wet.....
Announcer was awesome. Pace car in, pack rounding turn 12 "and we are GREEN! GREEN! GREE....oh ****************!!!". Hilarious. One od the gilsdorfs drove his rookie event in that race (his brothers decorated the car w/ tampax livery). He crossed start/finish backward.....and hit the wall. Great weekend despite the weather.


Question about your car. You mention removing the ps pump. Did you go electric, convert the rack, or use a manual rack? How's it drive?

Originally Posted by Eric523

haha, that would be quite the ride! About 4500 miles round trip from my place. Hopefully it wouldn't end up like the last PCA event there with all of the nice machinery going down on the first lap I would have likely been 2 or 3 rows behind them, right in the thick of the mess!

However, I may make the trip to COTA next year if it is available again. Timing just didn't work out this time around.

[Eric523]

Originally Posted by insite

Yeah, that was quite a spectacle! It WAS pretty wet.....
Announcer was awesome. Pace car in, pack rounding turn 12 "and we are GREEN! GREEN! GREE....oh ****************!!!". Hilarious. One od the gilsdorfs drove his rookie event in that race (his brothers decorated the car w/ tampax livery). He crossed start/finish backward.....and hit the wall. Great weekend despite the weather.


Question about your car. You mention removing the ps pump. Did you go electric, convert the rack, or use a manual rack? How's it drive?

Yeah, there are quite a few stories floating around about the debacle.

I removed the stock pump. Installed the electric cup/rsr style unit in the front trunk. It drives great! With the big slicks on the front, the steering still feels very similar to my stock street car. I thought I would hate it, but it gives enough feedback, and the lower effort is nice on the hot three day weekends.

Edit: there is a picture of the elec pump in the front trunk in post #45

[Eric523]

finally got the thing back together for the big Festival of Speed event at AAA Speedway.

New carbon dash, removed 15lbs


new carbon/kevlar seat, new carbon 996 cup doors, new wireless steering wheel that controls Motec display and modes, and a radio button.


new prototype race roof with windows


New 280/650/18 front slicks, went to a wider 10.5'' wheel on the front. Now 18x10.5'' square with 280/680/18 rear and 280/650/18 front.


In the mix with a handful of cup cars and RSR's throughout the weekend.


Best battle was with this 3.9L 400hp 993RSR from Rothsport Racing.


New carbon front fenders, headlight replacement covers, late 996 GT3 bumper and cup splitter


carbon 996 cup doors, cup lexan windows, cup mirrors

[insite]

incredible. did you make that top, or buy it? never seen one like that.

[Eric523]

Originally Posted by insite

incredible. did you make that top, or buy it? never seen one like that.

we made it. Made a quick thread on it here : New Boxster Hard Top Prototype

[Crono0001]

God. That's not even a boxster anymore. It's like a mid-engine 911 :P

[Eric523]

in car video from Festival of Speed :

[jaykay]

Sweet video...love the part where you kept momentum and it bouncing off the limiter to try and suprise the rsr out of the chicane section.

Lots to learn from just watching your stuff

[Dr.Strangepork]

Originally Posted by Eric523

Been sharing a bit of my GT class Boxster build over the last few months. After a year and a half in the BSR I decided to make a jump to GT class power/weight racing. Considered selling the BSR and trying to get a cup or build a 911 car, but the Boxster platform has been so much fun to drive.

Fantastic thread. What are the rules in GT class? Does the car just have to fall within a certain power to weight range and you can do whatever else you want to it?

[Eric523]

Originally Posted by Dr.Strangepork

Fantastic thread. What are the rules in GT class? Does the car just have to fall within a certain power to weight range and you can do whatever else you want to it?

Thanks. Very few rules in the GT class so we can pretty much do what we want.

We have 3 types of tire to choose from: Slicks, DOT <100TW, and DOT>100TW
Cars with slicks must run the most weight, less for <100TW, then even less for >100TW. I've chosen slicks, as does most everyone in the higher classes because the DOT's overheat on the higher HP/higher grip cars. We also have a great contingency program with Yokohama, which is why I have so many of their stickers on my car. Last race weekend, I won a full set of 4 valued at around $2k for my class wins.

Class with Slicks

GT1 less than 7.01 lbs/hp
GT2 7.01-9 lbs/hp
GT3 9.01-11.5 lbs/hp ** I ran 316rwhp and 2850lbs last race (restricted hp and added ballast)
GT4 11.51-14 lbs/hp
GT5 14.01-16.5 lbs/hp
GT6 above 16.5 lbs/hp

Weight is including driver and fuel and you must meet weight at any time during qualifying or the race. We always get weighed in after the race (top 3 finishers).

Only rules are:

-Car are limited to one wing (no front wings attached to the hood). Wings must be single element (no multi element wings). No active or in car adjustable aerodynamic devices.

-All engine swaps must be of the same manufacture.

-all tube frame cars must take the slick weight requirements

-maximum of 350lbs of ballast

-switchable ECU's must be declared, inspected, and explained

[Dragonwind]

Thanks for keeping this updated Eric! I love what you've done.
Chris

[Eric523]

fresh dyno certification runs for the POC event at Buttonwillow this weekend. The boss programmed a drop of about 10 HP to lighten the car 90lbs.



The girlfriend's pink one is coming out to race this weekend too!